Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh vai » hanh vi, hanh tai, hanh van
cham luc » cham soc, nhan luc, cham cuu
mai khoi » mai khoa, tai khoa, cac khoi
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » dai hoi, lai hoi, mai doi
ky tang » ky nang, ky dang, kho tang
va cham » va chat, va tham
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky tang ((mai hoi) or (mai khoi)). lieu va cham luc va ((hanh vai) or (hanh va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang ((mai hoi) OR (mai khoi)). lieu va cham luc va ((hanh vai) OR (hanh va)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang ((mai hoi) or (mai khoi)). lieu va cham luc va ((hanh vai) or (hanh va)) cau tren*.